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Investment Securities - Schedule of Investment Securities (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Securities Available-for-Sale |  |
Amortized Cost | $ 1,098,320 | $ 1,262,761
Gross Unrealized/Unrecognized Holding Gains | 5,905 | 7,687
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 10,409 | 12,309
Estimated Fair Value | 1,093,816 | 1,258,139
Securities Held-to-Maturity |  |
Securities held-to-maturity, at amortized cost (fair value of $363,779 and $256,672 at December 31, 2017 and 2016, respectively) | 357,197 | 259,833
Gross Unrealized/Unrecognized Holding Gains | 7,333 | 2,074
Gross Unrealized/Unrecognized Holding Losses | 751 | 5,235
Estimated Fair Value | 363,779 | 256,672
Obligations of U.S. Treasury and other U.S. Government sponsored entities |  |
Securities Available-for-Sale |  |
Amortized Cost | 245,000 | 270,000
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 2,280 | 2,467
Estimated Fair Value | 242,720 | 267,533
Obligations of States and Political Subdivisions |  |
Securities Held-to-Maturity |  |
Securities held-to-maturity, at amortized cost (fair value of $363,779 and $256,672 at December 31, 2017 and 2016, respectively) | 300,412 | 188,622
Gross Unrealized/Unrecognized Holding Gains | 6,575 | 977
Gross Unrealized/Unrecognized Holding Losses | 713 | 5,148
Estimated Fair Value | 306,274 | 184,451
U.S. Government sponsored entity asset-backed securities |  |
Securities Available-for-Sale |  |
Amortized Cost | 852,645 | 991,642
Gross Unrealized/Unrecognized Holding Gains | 4,645 | 5,372
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 8,129 | 9,842
Estimated Fair Value | 849,161 | 987,172
Securities Held-to-Maturity |  |
Securities held-to-maturity, at amortized cost (fair value of $363,779 and $256,672 at December 31, 2017 and 2016, respectively) | 56,785 | 71,211
Gross Unrealized/Unrecognized Holding Gains | 758 | 1,097
Gross Unrealized/Unrecognized Holding Losses | 38 | 87
Estimated Fair Value | 57,505 | 72,221
Equity securities |  |
Securities Available-for-Sale |  |
Amortized Cost | 675 | 1,119
Gross Unrealized/Unrecognized Holding Gains | 1,260 | 2,315
Estimated Fair Value | $ 1,935 | $ 3,434

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